Weird bump in wheel

themoog
themoog Posts: 22
edited January 2011 in Workshop
Hi,
I'm hoping someone can help as I've drawn a blank. Bit of background info in case this is useful - I've had a few problems with slow punctures in one wheel lately. I finally think I've found the source of the punctures (a tiny piece of glass) but have discovered a new problem.

When cycling along it feels as though there is a bulge in one area of the tyre, so it's like cycling over a bump every metre or so. There definitely isn't a bulge in the tyre - I've tried changing both tyre and tube but the problem persists.

Is the problem with the wheel (it's a 6-month old Fulcrum Racing 7)? Any ideas what it might be?

Thanks for your help.

Comments

  • JamieW
    JamieW Posts: 114
    Is the wheel round??

    When u spin it can u see an obvious buckle / deformation either laterally or vertically??
  • ynyswen24
    ynyswen24 Posts: 703
    Is it the rim joint? Depending on the make/model of the rim you may get a slight inconsistency where the rim is joined to form the hoop and now be aware of it after having the puncture
  • ride_whenever
    ride_whenever Posts: 13,279
    check the radial true... use a pencil held against the frame to give you a fixed point and spin the wheel, should be relatively clear.
    Neeermad
    Carbon 456
    456 lefty
    Pompino
    White Inbred
  • Monty Dog
    Monty Dog Posts: 20,614
    Are your sure the tyre is bedded correctly into the well of the rim or the inner tube hasn't been kinked when fitted? Unless you've struck a pothole or kerb hard to distort the rim, 99% of such problems are due to the tyre / tube being incorrectly fitted.
    Make mine an Italian, with Campagnolo on the side..
  • themoog
    themoog Posts: 22
    Thanks for all the responses - i think I'm going to get the LBS to have a look at it. I think there's a buckle and I'm too lazy to faff with it.

    Cheers everyone!
  • GeorgeShaw
    GeorgeShaw Posts: 764
    It's easy enough to make a rough check on what might be out of true. Spin the wheel and look at the brake blocks. What moves laterally or radially with respect to the blocks ? If it's the rim, then that's the problem. If not, it's the tyre or tyre fitting.
  • 45rpm
    45rpm Posts: 43
    is the inner tube the right size for the tire your using?
  • themoog
    themoog Posts: 22
    Yep, inner tubes are correct, and I'm fairly sure the tyre is seated correctly (I'm not with tyre at the moment hence the vagueness). i've been changing tyres and tubes for several years now without any probs but I will happily accept that I might have got it wrong on this occasion (I will check later!)

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